I will throw in my 2 cents,
This is all 454 not 402 but my engine guy, (that built engine's for the outlaw circuit back in the day) was a big block guru, (30 years ago). Anyway I fixed up a 1979 1/2 ton stepside, 4x4 from the ground up.
New paint and interior
4 inch lift with 35 inch tire's
Swapped in 8 lug axle's with 4.11 gears, with locker
454, 0 deck, flat tops
3904390 heads, unshrounded and ported with hardened valve seats
mild 268h comp cam.
dual plane intake.
3310 holley carb.
turbo 400 trans. with turbo 350 first and second gear ratio
2,000 rpm converter
We went to heads up drag day in redding c.a. and turned a 14.6 in the quarter mile on 35 inch rubber with a small cam and little closed chamber heads. Not bad for a 4x4 truck. It was my daily back then and it towed **** down the highway all the time, (92 pump gas), with tons of bottom end torque.
My 1977 crew cab 4x4 I just sold has 12 inches of lift, 44 inch tires, 4.88 gear's and basically the same 454 short block as the step side with 3964290 closed chamber heads and more port work with a 270 comp hyd. roller cam is a beast as well. Used to haul a 25 foot travel trailer all over the place with my 77 and could do 80mph up 8 percent grade's if I wanted to.
Anyway I think on the cheap you could make a 402 big block with closed chamber heads an animal for a truck with the right combo. Sure a 454 or bigger would be the way to go but I think the 402 could be a fun engine.
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